--- title: D-Dimer Test type: test id: d-dimer url: "https://www.test-well.com/tests/d-dimer" price_usd: 69.99 lab_fee_usd: 6 all_in_usd: 75.99 cpt: 85379 category: Blood Health sample: Blood draw fasting_required: false results_in: "1–3 business days" labs: - Quest - Labcorp - BioReference orderable: true reviewed_at: 2026-09-14 order_url: "https://www.test-well.com/cart?add=d-dimer&utm_source=ai_agent&utm_medium=markdown" --- # D-Dimer Test > Detects fibrin degradation in your blood — used to rule out blood clots like DVT or pulmonary embolism, measured from a standard blood draw. At TestWell it costs $69.99 plus a $6 lab fee, needs no fasting, and results post in 1–3 business days. Physician-authorized with no doctor's visit or insurance needed; draw at Quest or Labcorp. ## Key facts | Fact | Value | | --- | --- | | Price | $69.99 + $6 lab processing fee per order ($75.99 all-in for this test alone) | | CPT code | 85379 | | Sample | Blood draw | | Fasting | Not required | | Results | 1–3 business days | | Labs | Quest Diagnostics, Labcorp, BioReference (NY & NJ) | | Biomarkers measured | 1 | | Physician authorization | Included — no doctor's visit, referral or insurance needed | | Payment | Card, HSA or FSA; cash-pay only (no insurance billing) | ## What does the D-Dimer test tell you? Detects fibrin degradation in your blood — used to rule out blood clots like DVT or pulmonary embolism. D-Dimer is a small protein fragment produced when a blood clot breaks down through fibrinolysis. Elevated D-Dimer levels indicate that abnormal clotting and clot breakdown are happening somewhere in the body. The test is most often used to rule out venous thromboembolism (VTE) — including deep vein thrombosis (DVT) and pulmonary embolism (PE) — in patients with a low clinical pretest probability. A negative D-Dimer in a low-risk patient effectively excludes VTE without further imaging. D-Dimer is also used to monitor disseminated intravascular coagulation (DIC), assess recurrent VTE risk after stopping anticoagulation, and evaluate ongoing fibrinolysis. Note: D-Dimer is sensitive but not specific — it can be elevated in pregnancy, post-surgery, infection, malignancy, and aging, so an elevated result requires clinical context. **Clinical use:** Measures fibrin degradation fragments released when a blood clot breaks down. Primarily used to help rule out venous thromboembolism — deep vein thrombosis (DVT) and pulmonary embolism (PE) — and to monitor clotting activity. ## Who should order it? People whose clinician suggested clot rule-out monitoring, those with a personal or family history of clotting events tracking a baseline, and anyone re-checking levels after completing anticoagulation under medical guidance. ## Biomarkers measured - [D-Dimer (Quantitative)](https://www.test-well.com/biomarkers/d-dimer) ## Price by lab | Lab | Test price | All-in (with $6 fee) | Notes | | --- | --- | --- | --- | | Quest Diagnostics | $69.99 | $75.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | | Labcorp | $69.99 | $75.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | | BioReference (NY & NJ) | $34.99 | $40.99 | New York and New Jersey orders route here automatically | Rhode Island is not served. Prices are identical online and in the lab; no draw fee or physician fee is added. ## How much does a D-Dimer test cost? A D-Dimer test costs $69.99 at TestWell — $75.99 all-in when ordered alone, because the $6 lab processing fee is charged once per order, with no draw fee or physician fee added. Hospital outpatient labs typically bill around $130.00 self-pay for the same test, and often more. With insurance, what you pay depends on your deductible and your plan's negotiated rate; TestWell's price is fixed before the draw and is HSA/FSA-eligible. | Where you order | Price | One test, all-in | Notes | | --- | --- | --- | --- | | TestWell (drawn at Quest or Labcorp) | $69.99 | $75.99 | Includes the one $6 lab processing fee, charged once per order | | Hospital outpatient lab, self-pay (typical) | $130.00 | $130.00 | Reference figure; hospital charges vary widely by facility and are often higher | Lab test codes: Quest test code 8659 · Labcorp test no. 115188 · BioReference code 5743-0. ## How do you prepare? No fasting required. Take your normal medications. Inform the lab if you've had recent surgery, are pregnant, or have an active infection — these can elevate D-Dimer naturally. ## Related conditions - Pulmonary embolism (I26.99) - Deep vein thrombosis (I82.40) - Disseminated intravascular coagulation (D65) ## Is the D-Dimer worth it? > Situational, and safety comes first: if you have sudden leg swelling and pain, chest pain, or shortness of breath, do not order a test online - go to an emergency room now. Ordered with a provider's guidance, a D-Dimer is a useful rule-out for blood clots, but it is not a self-diagnosis tool for an acute emergency. ### Worth it if you… - Following up a clotting question with a provider who specifically asked for a D-Dimer - Monitoring after a previously treated DVT or pulmonary embolism, under medical guidance - Documenting a normal value when clot risk is low and a clinician wants objective reassurance - People who cannot get D-Dimer through Quest Direct or Labcorp OnDemand (neither sells it to consumers) and are working with a telehealth provider ### You can probably wait if you… - You have acute symptoms of a clot (one-sided leg swelling, chest pain, trouble breathing) - this is an ER visit, not an online order - You want a general wellness screen - D-Dimer is non-specific and rises with age, infection, pregnancy, and inflammation, so it is a poor routine test ### At home or in the lab? At-home collection is available. D-Dimer is a standard venous blood draw at Quest or Labcorp, or an at-home mobile draw where available. Because Quest Direct and Labcorp OnDemand do not sell D-Dimer to consumers, third-party resellers charge $111+; TestWell runs the identical Quest/Labcorp assay for $69.99. Turnaround is 1-3 business days - which is exactly why it is the wrong tool for a suspected acute clot, where you need an ER and imaging the same hour. ### How do you read the results? | Result | Typical adult range | What an out-of-range value can mean | | --- | --- | --- | | D-Dimer | Under 0.50 mcg/mL FEU (age-adjusted) | A normal (low) result makes an active clot unlikely - its strength is ruling clots out. A high result is non-specific: clots raise it, but so do infection, recent surgery, pregnancy, age, and inflammation, so an elevated value needs clinical follow-up, not panic. | _This section medically reviewed; last reviewed 2026-07-17._ ## Common questions about the D-Dimer test ### What does a D-Dimer test measure? D-Dimer is a protein fragment produced when a blood clot dissolves. Nearly undetectable in most healthy people, it rises when significant clot formation and breakdown are happening somewhere in the body — which is why it's the standard first-line blood test when a clot is suspected. ### What is a normal D-Dimer level? Most labs use a cutoff around 0.50 mg/L FEU (500 ng/mL) — results below that are considered negative. Because D-Dimer rises naturally with age, clinicians often apply an age-adjusted cutoff (age × 10 ng/mL for people over 50). Your report will show the exact reference range for the lab that ran your sample. ### Can a D-Dimer test diagnose a blood clot? No — it's a rule-out test, not a rule-in test. A negative D-Dimer in a low-risk person makes an active clot very unlikely. An elevated result does NOT confirm a clot: age, pregnancy, recent surgery, infection, and inflammation all raise D-Dimer. Elevated results need clinical follow-up, usually imaging like ultrasound or CT angiography. If you have symptoms like leg swelling, chest pain, or shortness of breath, seek immediate medical care rather than waiting on lab work. ### How much does a D-Dimer test cost without insurance? On TestWell, the quantitative D-Dimer is $69.99 ($34.99 for NY/NJ via BioReference). Quest Direct and Labcorp OnDemand don't sell D-Dimer to consumers at all — third-party resellers charge $111.90-$128 for the same test at the same labs, and hospital labs typically bill $130+. ### What is the CPT code for a D-Dimer test? Quantitative D-Dimer is billed under CPT 85379. Cash-pay patients don't need the code to order through TestWell — it's listed for records and HSA/FSA reimbursement. ### Do I need to fast before a D-Dimer test? No fasting required, and you should take your normal medications. Tell the lab if you've had surgery recently, are pregnant, or have an active infection — all three can elevate D-Dimer without any clot being present. ### What other tests pair well with D-Dimer? For a broader clotting and inflammation picture, D-Dimer is often ordered alongside [Fibrinogen Activity](https://www.test-well.com/tests/fibrinogen-test) (the clotting protein D-Dimer derives from), a [CBC with Differential](https://www.test-well.com/tests/cbc-with-differential) (platelet count), and [hs-CRP](https://www.test-well.com/tests/hs-crp) (systemic inflammation, which can elevate D-Dimer). All can be drawn in the same visit. ### Should I order a D-Dimer if I think I have a blood clot right now? No. If you have symptoms of a clot - sudden one-sided leg swelling or pain, chest pain, or shortness of breath - go to an emergency room immediately. A D-Dimer takes 1-3 business days to result and is only meaningful alongside a clinical risk assessment and imaging. Online lab testing is for planned, non-emergency situations. ### Why is D-Dimer so much cheaper on TestWell than elsewhere? Quest Direct and Labcorp OnDemand do not offer D-Dimer to consumers at all, so the only other way to buy it yourself is through third-party resellers that mark it up to $111-$128. TestWell orders the same test at the same Quest or Labcorp lab for $69.99 because the physician authorization and lab access are built in rather than resold. ### What does a high D-Dimer actually mean? D-Dimer measures a breakdown product of blood clots, so it rises when clotting is active - but it also rises with infection, recent surgery or injury, pregnancy, liver disease, and simply older age. That makes it excellent at ruling clots out when normal, but a high value on its own does not diagnose a clot; it is a prompt for clinical evaluation. ## How to order 1. Add to cart: https://www.test-well.com/cart?add=d-dimer&utm_source=ai_agent&utm_medium=markdown 2. Create an account or sign in, confirm your state and preferred lab, pay by card, HSA or FSA. 3. A licensed physician authorizes the order (usually within minutes); the requisition arrives by email. 4. Walk into any Quest Diagnostics, Labcorp, BioReference (NY & NJ) patient service center — no appointment needed at most sites. 5. Results post to your TestWell portal in 1–3 business days with reference ranges and flags. ## Related - [Factor V Leiden Mutation](https://www.test-well.com/tests/factor-v-leiden) — $131.99 - [Haptoglobin](https://www.test-well.com/tests/haptoglobin-test) — $101.99 - [Immature Red Blood Cell Test](https://www.test-well.com/tests/reticulocyte-count) — $19.99 - [Prothrombin Time with INR](https://www.test-well.com/tests/prothrombin-time-inr) — $23.99 - [PT and PTT (Prothrombin & Partial Thromboplastin Time)](https://www.test-well.com/tests/pt-and-ptt) — $54.99 - [All Blood Health tests](https://www.test-well.com/tests/category/blood-health) - [Full test directory](https://www.test-well.com/tests/directory) --- Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-14. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md Canonical page: https://www.test-well.com/tests/d-dimer Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.